| The influence of position on ventilation-perfusion distribution after abdominal surgery. | |
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MedLine Citation:
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PMID: 3188829 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of a change in position on gas exchange and ventilation perfusion (VA/Q) distribution were studied in 12 patients, after abdominal surgery. VA/Q distribution was determined from retention and excretion curves of six inert gases of different solubilities, in supine and sitting patients, during spontaneous breathing. Changing position from supine to sitting resulted in an increase in minute ventilation and a decrease in PaCO2 without any change in PaO2. With regard to VA/Q distribution, an estimated shunt of 5.2% +/- 3.4 was documented in all the patients in the supine position, and was associated with a large percentage of low VA/Q regions (20.0% +/- 13.0) in six of them. Patients with associated estimated shunt and low VA/Q regions were those with the greatest amount of venous admixture (respectively: 27.3% +/- 7.2, and 14.9% +/- 3.0, for patients without low VA/Q regions, P less than 0.01). When patients were placed in the sitting position, the estimated shunt was not reduced, but the percentage of low VA/Q regions decreased when it was documented. Despite the improvement of VA/Q distribution in the sitting position, the lack of significant change in PaO2 may be explained by the simultaneous decrease in PVO2 caused by a decrease in cardiac output. |
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Authors:
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F Bonnet; J L Bourgain; D Matamis; B Tesseire; P Viars |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Acta anaesthesiologica Scandinavica Volume: 32 ISSN: 0001-5172 ISO Abbreviation: Acta Anaesthesiol Scand Publication Date: 1988 Oct |
Date Detail:
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Created Date: 1988-12-08 Completed Date: 1988-12-08 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 0370270 Medline TA: Acta Anaesthesiol Scand Country: DENMARK |
Other Details:
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Languages: eng Pagination: 585-9 Citation Subset: IM |
Affiliation:
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Department of Anaesthesiology, Hôpital Henri Mondor, Créteil, France. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Aorta, Abdominal / surgery* Female Humans Male Middle Aged Postoperative Period Posture* Ventilation-Perfusion Ratio* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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